EP2329050A1 - A method of agglomeration of ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines - Google Patents

A method of agglomeration of ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines

Info

Publication number
EP2329050A1
EP2329050A1 EP09815780A EP09815780A EP2329050A1 EP 2329050 A1 EP2329050 A1 EP 2329050A1 EP 09815780 A EP09815780 A EP 09815780A EP 09815780 A EP09815780 A EP 09815780A EP 2329050 A1 EP2329050 A1 EP 2329050A1
Authority
EP
European Patent Office
Prior art keywords
fines
ferroalloy
agglomeration
agglomerates
ferromanganese
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09815780A
Other languages
German (de)
French (fr)
Other versions
EP2329050A4 (en
Inventor
Veerendra Singh
Saripalli M. Rao
Prasanta Mallick
Srivivas Dwarapudi
P. K. Mishra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tata Steel Ltd
Original Assignee
Tata Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tata Steel Ltd filed Critical Tata Steel Ltd
Publication of EP2329050A1 publication Critical patent/EP2329050A1/en
Publication of EP2329050A4 publication Critical patent/EP2329050A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/148—Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys

Definitions

  • ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines
  • the present invention relates to a method of agglomeration of Ferroalloy fines such as Ferromanganese, Ferrosilicon, Silicomanganese and Ferrochrome fines. More particularly, the present invention relates to a method of agglomeration of Ferromanganese fines from sized ferromanganese cake.
  • ferroalloys containing from as little as 5 to as much as 85 percent of the input to the charge, bath, ladle and the mold.
  • Important ferroalloy product are Ferrosilicon, high carbon Ferromanganese and ferrochromium, silicomanganese, and calcium suicide which are usually manufactured in electric furnace.
  • low grade ferroalloys are produced more cheaply in the blast furnace, from silicon, manganese or chromium bearing ores or concentrates. Such ferroalloys are produced in the form of cake.
  • the ferroalloys cake such as Ferromanganese, ferrosilicon or ferrochromium are generally broken down to 10 to 150 mm size lumps.
  • the ferroalloy fines of ⁇ 10mm size are generated by crushing different sizes of lumps. The ferroalloy fines thus produced are relatively cheaper.
  • Another object of the invention is to develop agglomerate from Ferroalloy fines via expropriate sizing of .fines, mixing the fines with a specific binder and compacting.
  • a further object of the invention is to select a specific binder for the agglomeration through test evolution having its materials characteristics different from conventional sodium silicate or Bentonite binder.
  • the proposed invention has been exemplified by an embodiment for agglomeration of Fe-Mn fines, which is however applicable to agglomerate Fe-si and Fe-cr fines also, with the same method steps and conditions maintained in the method disclosed in respect of Ferromanganese fines agglomeration.
  • binders available in the market for agglomeration of ore fines.
  • Phenol formaldehyde according to the invention for resin is selected for use as a binder for Ferromanganese fines (0-3mm) to produce agglomerate through characterized testing for a desired strength.
  • a method of agglomeration of ferroalloy fines comprising the steps of crushing the ferroalloy cakes to 3mm size; mixing at least binder such as phenol-formaldehyde resin (Resol Resin) selected through characterized evaluation of agglomerates having desired strength according to tumbler index, compressive and tensile strength; compacting the mixture in a compression machine of at least 5 ton load Capacity; curing the compact in a furnace maintained at 150° to 200° C, for a period of 60 to 90 minutes.
  • binder such as phenol-formaldehyde resin (Resol Resin) selected through characterized evaluation of agglomerates having desired strength according to tumbler index, compressive and tensile strength
  • Figure 1 relates to a Process flow sheet to produce ferromanganese agglomerate with desired strength.
  • the step of the agglomeration of ferroalloy fines as shown in figure 1 are as follows:
  • a. Sizing and Crushing the oversize (>3mm) particles In the process of sizing of casted ferromanganese cakes, the material generated below 10mm is termed as fined in ferroalloy industry. The fines ⁇ 3mm can be agglomerate directly but the fines >3mm cannot be agglomerated suitably by conventional agglomeration methods and crushing is required to reduce ⁇ 3mm size range.
  • Binder Mixing the binder in wt% is mixed with the fines for proper distribution of binder in the material. Binder properties are given in table- 1. Table - 1: Binder properties
  • the green strength of the agglomerate is 7 drops from 500cm height.
  • the agglomerate is a cylindrical briquette of 3 cm diameter and 2.0 cm length.
  • the prepared agglomerates according to the invention can be used as a replacement of ferromanganese lumps.
  • the physical properties of the agglomerates are comparable to commercially available ferromanganese lumps.
  • These agglomerates can be used in the process like refining the steel in the ladle vessel.
  • the bulk density of agglomerates has been found to be between5208 - 5210 kg/m 3 and those do not float on the slag, sink properly in the metal, and shows better dissolving characteristics.
  • the compressive strength and tumbler index (TI) of material are suitable for the transportation circuit and do not generate excessive fines.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A method of agglomeration of ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines comprising the steps of: Providing ferroalloy fines below 10mm size; Sieving <3mm size fraction and crushing 3-10mm to produce <3mm fines; mixing the resulted fines with a phenol formaldehyde resol resin binder in a vessel; compacting the mixed fines in a compressive machine in batches to form agglomerates; curing the agglomerates on heating in a furnace maintained at a temperature range 150-200°C for about 60 to 90 minutes.

Description

A method of agglomeration of ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines
FIELD OF THE INVENTION
The present invention relates to a method of agglomeration of Ferroalloy fines such as Ferromanganese, Ferrosilicon, Silicomanganese and Ferrochrome fines. More particularly, the present invention relates to a method of agglomeration of Ferromanganese fines from sized ferromanganese cake.
BACKGROUND OFTHE INVENTION
In order to produce better quality of steel in open Hearth furnaces, it is necessary to add silicon, chromium, phosphorus etc. in the form of ferroalloys containing from as little as 5 to as much as 85 percent of the input to the charge, bath, ladle and the mold. Important ferroalloy product are Ferrosilicon, high carbon Ferromanganese and ferrochromium, silicomanganese, and calcium suicide which are usually manufactured in electric furnace. However low grade ferroalloys are produced more cheaply in the blast furnace, from silicon, manganese or chromium bearing ores or concentrates. Such ferroalloys are produced in the form of cake. The ferroalloys cake such as Ferromanganese, ferrosilicon or ferrochromium are generally broken down to 10 to 150 mm size lumps. The ferroalloy fines of < 10mm size are generated by crushing different sizes of lumps. The ferroalloy fines thus produced are relatively cheaper.
In the state of art agglomeration of ores and concentrates through the routes of nodulizing, palletizing or briquetting and sintering are known. But agglomeration of ferroalloy fines is yet to be developed in this field of technology.
OBJECT OF THE INVENTION
It is therefore an object of the invention to propose a method of agglomeration of Ferro-alloy fines specifically Ferromanganese, ferrochrome and Ferrosilicon fines to produce cheaper ferroalloys.
Another object of the invention is to develop agglomerate from Ferroalloy fines via expropriate sizing of .fines, mixing the fines with a specific binder and compacting.
A further object of the invention is to select a specific binder for the agglomeration through test evolution having its materials characteristics different from conventional sodium silicate or Bentonite binder.
SUMMARY OF THE INVENTION The proposed invention has been exemplified by an embodiment for agglomeration of Fe-Mn fines, which is however applicable to agglomerate Fe-si and Fe-cr fines also, with the same method steps and conditions maintained in the method disclosed in respect of Ferromanganese fines agglomeration.
There are various kind of binders available in the market for agglomeration of ore fines. The nature of Ferromanganese fines (0-3mm) being very different as that from iron ore and the conventional binder (Sodium Silicate, Bentonite), the known method is not capable to produce agglomerate of Ferroalloy with suitable handling properties (Tumbler Index, Compressive, and Tensile Strength) for plant scale operations. Phenol formaldehyde according to the invention for resin is selected for use as a binder for Ferromanganese fines (0-3mm) to produce agglomerate through characterized testing for a desired strength.
Various proportions in weight % in the range of 2 to 10% of the binder were tested for the ferromanganese fines and it was found that 3 to 5% binder content is the optimum content to achieve the desired properties with minimum cost.
Accordingly, there is provided a method of agglomeration of ferroalloy fines comprising the steps of crushing the ferroalloy cakes to 3mm size; mixing at least binder such as phenol-formaldehyde resin (Resol Resin) selected through characterized evaluation of agglomerates having desired strength according to tumbler index, compressive and tensile strength; compacting the mixture in a compression machine of at least 5 ton load Capacity; curing the compact in a furnace maintained at 150° to 200° C, for a period of 60 to 90 minutes.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The proposed invention will be better understood from the accompanying drawing in which Figure 1 relates to a Process flow sheet to produce ferromanganese agglomerate with desired strength.
DETAILED DESCRIPTION OF THE INVENTION
The step of the agglomeration of ferroalloy fines as shown in figure 1 are as follows:
a. Sizing and Crushing the oversize (>3mm) particles: In the process of sizing of casted ferromanganese cakes, the material generated below 10mm is termed as fined in ferroalloy industry. The fines <3mm can be agglomerate directly but the fines >3mm cannot be agglomerated suitably by conventional agglomeration methods and crushing is required to reduce <3mm size range. b. Binder Mixing: the binder in wt% is mixed with the fines for proper distribution of binder in the material. Binder properties are given in table- 1. Table - 1: Binder properties
c. Compacting: The 60 to 80 gm of mixed material is kept in a die of diameter of 3 cm, and compressed by using compressive machine upto 5- ton load. The prepared agglomerate is removed and stored for further processing.
The green strength of the agglomerate is 7 drops from 500cm height. The agglomerate is a cylindrical briquette of 3 cm diameter and 2.0 cm length.
d. Curing: The prepared agglomerate is cured at 150°C to 200°C for 60 to 90 minutes. This product is then stored and can be used in place of ferromanganese lumps.
e. Testing: The handling properties of the agglomerated material play a vital role for plant scale operations and generation of fines is undesired. The compressive strength of the agglomerate has been tested using a UTM machine and its properties are listed below in Table-2.
Table - 2: Agglomerate properties
A comparative test result of strength characteristics between the resulted agglomerates of ferromangaήese produced according to the invention, and that of known ferromanganese lumps are enumerated below in table 3.
Table - 3:
Advantages of the Invention
The prepared agglomerates according to the invention can be used as a replacement of ferromanganese lumps. The physical properties of the agglomerates are comparable to commercially available ferromanganese lumps. These agglomerates can be used in the process like refining the steel in the ladle vessel. The bulk density of agglomerates has been found to be between5208 - 5210 kg/m3 and those do not float on the slag, sink properly in the metal, and shows better dissolving characteristics. The compressive strength and tumbler index (TI) of material are suitable for the transportation circuit and do not generate excessive fines.
The proposed invention as narrated herein should not be read in restrictive manner as various adaptations, modifications and alterations regarding process steps and process conditions are possible within the scope and ambit of the invention as defined in the appetent claims.

Claims

WE CLAIM
1. A method of agglomeration of ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines comprising the steps of:
Providing ferroalloy fines below 10mm size;
Sieving <3mm size fraction and crushing 3-10mm to produce <3mm fines;
mixing the resulted fines with a phenol formaldehyde reso! resin binder in a vessel;
compacting the mixed fines in a compressive machine in batches to form agglomerates;
' curing the agglomerates on heating in a furnace maintained at a temperature range 150-200°C for about 60 to 90 minutes.
2. A method of agglomeration of ferroalloy fines as claimed in claim 1, wherein the binder is selected as a phenol-formaldehyde resin (Resol Resin) of with PH (1% solution) - 7.15, specific gravity 1.18, solid content 70.65%, viscosity at 25°C, 200cps. Min and carbon 38%.
3. A method of agglomeration of ferroalloy fines as claimed in 1 or 2, wherein the binder is mixed with the ferroalloy fines in a proportion of 3 - 5% by wt.
4. A method of agglomeration of ferroalloy fines as claimed in claim 1, wherein the mixed fines is compressed in the compressive machine to obtain the agglomerates with green strength of 7 drops from 500 cm height.
5. A method of agglomeration of ferroalloy fines as claimed in claim 1 wherein the cured agglomerates has cylindrical size of 3cm dia and 2cm height, area 0.0007065, volume 0.000014, weight 0.073 gm, bulk density 5208 - 5210 kg/M3, breaking load - 39, 000 Newton, compressive strength 55 Mpaf tumbler index - 94%, abrasion index - 3%.
6. A method of agglomeration of ferroalloy fines as claimed in any of the preceding claims, wherein the agglomerates have compressive strength of 55 to 70 MPa, bulk density 5208-5210 kg/M3.
EP09815780.3A 2008-09-29 2009-09-29 A method of agglomeration of ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines Withdrawn EP2329050A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1685KO2008 2008-09-29
PCT/IN2009/000532 WO2010035289A1 (en) 2008-09-29 2009-09-29 A method of agglomeration of ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines

Publications (2)

Publication Number Publication Date
EP2329050A1 true EP2329050A1 (en) 2011-06-08
EP2329050A4 EP2329050A4 (en) 2016-05-25

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ID=42059322

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09815780.3A Withdrawn EP2329050A4 (en) 2008-09-29 2009-09-29 A method of agglomeration of ferroalloy fines such as ferromanganese, ferrochrome and ferrosilicon fines

Country Status (5)

Country Link
EP (1) EP2329050A4 (en)
JP (1) JP2012504189A (en)
CN (1) CN101910427B (en)
WO (1) WO2010035289A1 (en)
ZA (1) ZA201004347B (en)

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Publication number Priority date Publication date Assignee Title
CN102266941A (en) * 2011-08-09 2011-12-07 吴庆定 High-efficiency and energy-saving low-carbon manganese ball production process
CN102296236B (en) * 2011-08-12 2012-12-05 河曲县万联节能材料有限公司 Wear resistant steel ball and segment specially used in mines
CN103042210B (en) * 2012-12-24 2015-06-03 秀山天雄锰业科技有限公司 Preparation method of high-pressure manganese balls
FI126719B (en) 2013-12-17 2017-04-28 Outotec Finland Oy Process for making manganese-containing iron alloy
GB201613915D0 (en) * 2016-08-15 2016-09-28 Binding Solutions Ltd Briquettes
CN111996369A (en) * 2020-08-28 2020-11-27 江苏江南铁合金有限公司 Ferrochromium powder ball for steelmaking and preparation method thereof

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Also Published As

Publication number Publication date
ZA201004347B (en) 2011-06-29
JP2012504189A (en) 2012-02-16
CN101910427B (en) 2012-11-07
WO2010035289A1 (en) 2010-04-01
EP2329050A4 (en) 2016-05-25
CN101910427A (en) 2010-12-08

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